Siemens SIWAREX WL260 Series - Page 36

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Figure 6-1 Residual temperature error for a load cell per 10 K temperature change when shortening or
lengthening the connecting cable
If three or four load cells are operated in parallel and the cable for a cell is lengthened, the
additional error is approximately one third or one quarter. This assumes that the load is
distributed evenly across the load cells.
Connecting cable in six-wire system
For connecting cables in the six-wire system, the supply voltage is fed back to the weighing
module as the reference voltage. Shortening or lengthening has no e󹪜ect on the measuring
result.
Additional connecting cables
The maximum permissible cable length between the load cell and the weighing module is stated
in the technical speci󹪝cations for the weighing module. In Ex applications, you must also take
into account the speci󹪝cations of the Ex i interface.
For connecting the junction box to the weighing module, to extend a load cell connecting cable
or for cross-connection of two junction boxes, a shielded, six-core cable must be used, e.g.
Li2Y2x0.75St+2x(2x0.34St)-CY Siemens Order No.: 7MH4 702‑8AG or, for intrinsically safe Ex
applications, 7MH4 702‑8AF.
Commissioning
6.2 Application planning
SIWAREX WL200
36 Operating Instructions, 12/2021, A5E02199611B-13